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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52834be36071f28c4136bd157b69a4b0f6f412aca086032b0043cecbbe0b4e4d' 
  AND token = 'h0u7EekSv17hdUSid8WDCOPX9ODER+1sRRx4thGX94E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}